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105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/*-
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* Copyright (c) 2012, 2010 Zheng Liu <lz@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _FS_EXT2FS_EXT2_EXTENTS_H_
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#define _FS_EXT2FS_EXT2_EXTENTS_H_
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#include <sys/types.h>
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#define EXT4_EXT_MAGIC 0xf30a
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#define EXT4_EXT_CACHE_NO 0
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#define EXT4_EXT_CACHE_GAP 1
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#define EXT4_EXT_CACHE_IN 2
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/*
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* Ext4 file system extent on disk.
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*/
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struct ext4_extent {
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uint32_t e_blk; /* first logical block */
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uint16_t e_len; /* number of blocks */
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uint16_t e_start_hi; /* high 16 bits of physical block */
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uint32_t e_start_lo; /* low 32 bits of physical block */
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};
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/*
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* Extent index on disk.
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*/
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struct ext4_extent_index {
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uint32_t ei_blk; /* indexes logical blocks */
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uint32_t ei_leaf_lo; /* points to physical block of the
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* next level */
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uint16_t ei_leaf_hi; /* high 16 bits of physical block */
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uint16_t ei_unused;
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};
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/*
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* Extent tree header.
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*/
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struct ext4_extent_header {
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uint16_t eh_magic; /* magic number: 0xf30a */
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uint16_t eh_ecount; /* number of valid entries */
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uint16_t eh_max; /* capacity of store in entries */
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uint16_t eh_depth; /* the depth of extent tree */
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uint32_t eh_gen; /* generation of extent tree */
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};
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/*
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* Save cached extent.
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*/
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struct ext4_extent_cache {
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daddr_t ec_start; /* extent start */
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uint32_t ec_blk; /* logical block */
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uint32_t ec_len;
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uint32_t ec_type;
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};
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/*
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* Save path to some extent.
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*/
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struct ext4_extent_path {
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uint16_t ep_depth;
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struct buf *ep_bp;
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bool ep_is_sparse;
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union {
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struct ext4_extent ep_sparse_ext;
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struct ext4_extent *ep_ext;
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};
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struct ext4_extent_index *ep_index;
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struct ext4_extent_header *ep_header;
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};
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struct inode;
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struct m_ext2fs;
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int ext4_ext_in_cache(struct inode *, daddr_t, struct ext4_extent *);
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void ext4_ext_put_cache(struct inode *, struct ext4_extent *, int);
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struct ext4_extent_path *
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ext4_ext_find_extent(struct m_ext2fs *fs,
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struct inode *, daddr_t, struct ext4_extent_path *);
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#endif /* !_FS_EXT2FS_EXT2_EXTENTS_H_ */
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